7i76eu steppers don't move

Hi,

I have a DMC2 Mini that I am trying to convert from the Chinese Mach3 board that it came with, to a 7i76eu controlled by linuxcnc.

But I am stuck at getting the stepper motors to move. The DMC2 comes with three Nema23 57-76 motors with built-in controllers, similar to this one:
www.aliexpress.com/item/1005006172891348.html
I have wired the motors like this:
EN-  -> TB2 pin 1 GND
EN+ -> TB2 pin 6 +5VP
DR-  -> TB2 pin 4 DIR1-
DR+ -> TB2 pin 5 DIR1+
PU-  -> TB2 pin 2 STEP0-
PU+ -> TB2 pin 3 STEP0+
But nothing happens when I try to jog the axis. The DRO in the UI change, but the steppers are totally silent. After a while jogging around, I usually get a "Join 0 following error".
I can measure +5v on EN, so I believe that the axis is enabled.

I have just installed LinuxCNC from the livecd, and the configuration is made with pncconf.

Any ideas on what could be wrong, or what I can do to debug it? I don't have an oscilloscope, so I have a hard time actually confirming that the MESA card sends out pulses.

Thank you in advance!

Are the drives locked?

Note that on many step drives. the "enable" input is actually a disable input
and disables the drive when powered.

For checking outputs without a oscilloscope, you can measure the DIR output and
see if it changes when jogging in different directions

A following error may indicate a setup issue and needs to be resolved.

I think you are spot on with the "enable" output comment, the motors where not locked. I disconnected "EN+ -> TB2 pin 6 +5VP" and bingo, the motors where locked. So far so good, thank you I have measured Dir+/- and the voltage here change when I jog the axis.

But alas, the motors will still not move. How ever, now I get the "Joint 0 following error" immediately when I try to move the X axis, so I suspect this is why nothing is moving. I have tried to read up on the error, and it seems to point at a misconfiguration in the PID/Acelleration/etc part of the config. But I can't really see it being SO wrong, that the motor won't start at all?

If you get a following error, no further movement will be possible so a configuration
issue the causes a following error is s show-stopper.

Other possible reasons for no motion are wrong scaling, too short step lengths
high drive requirement (try single  ended wiring rather than differential)

Single ended wiring:

DRIVE STEP+  --> 7I76EU STEP+
DRIVE STEP-  --> 7I76EU GND

etc
 

PCW you are impressive! I checked the original wiring of the Mach3 board the mill came with, and it used single ended wiring using only the negative wires for STEP and DIR, so I tried to change that.
No change when using the UI, it still shows following error. But then I tried the servo tuning test in pncconf, and the steppers are now moving

Now I just need to figure out the following error, but at least now I know that the hardware is working.

Thank you very much, your help is much appreciated!

Hmmm, the plot thickens. If I run the qtdragon interface,as in the config file I have uploaded, I get the following error. But if I switch the UI to axis in the ini file, no other change, it works...any ideas how that can be?